With the development of current technology, many concepts of self-healing materials have recently been proposed. In this study, a preliminary healing ability is investigated by injecting a well-fabricated healing agent (bis-propargylsuccinate, BPS) into a crosslinked polymer (glycidyl azide polymer-based polyurethane, GAP-based PU) with the different assuming cuts. The results suggest that the stress at break of BPS injected the cut regions of the crosslinked PU is in the range of 0.169 – 0.218 MPa comparing with 0.244 MPa of the cut regions of the crosslinked PU, and the highest preliminary healing efficiency of BPS injected the cut regions of the crosslinked PU is achieved to be 86.0%. Moreover, the preliminary healing mechanism can base on the diffusion of BPS into the cut regions of the crosslinked PU, as well as the healed regions of the crosslinked PU with the different assuming cuts are stronger owing to the preliminary healable “azide-alkyne” click. As such, BPS is employed as a healing agent, as well as it becomes a promising candidate to apply for self-healing materials in crosslinked PU. Therefore, the synthesized BPS is injected to repair the damaged regions of the crosslinked PU in our first study, it is considered as new method to develop more study for capsule-based self-healing materials.